MIT Wirelessly Powers a Lightbulb
I realize you are joking, but:
"Lightsaber technology was developed over thousands of years. The first lightsaber models, used thousands of years BBY, had to be connected to an external power source since a power source small enough to fit in a saber's hilt had not yet been discovered. Power sources often consisted of a power pack worn on the back and connected to the lightsaber's hilt by a power cord."
Taken from Wikipedia.
This may be a point when dorkiness crosses the line into pedantry.